using System;
using System.Threading;
using iTextSharp.tool.xml.exceptions;
/*
 * $Id: AbstractPipeline.java 160 2011-06-07 09:34:57Z redlab_b $
 *
 * This file is part of the iText (R) project.
 * Copyright (c) 1998-2014 iText Group NV
 * Authors: Balder Van Camp, Emiel Ackermann, et al.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License version 3
 * as published by the Free Software Foundation with the addition of the
 * following permission added to Section 15 as permitted in Section 7(a):
 * FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY
 * ITEXT GROUP. ITEXT GROUP DISCLAIMS THE WARRANTY OF NON INFRINGEMENT
 * OF THIRD PARTY RIGHTS
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU Affero General Public License for more details.
 * You should have received a copy of the GNU Affero General Public License
 * along with this program; if not, see http://www.gnu.org/licenses or write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA, 02110-1301 USA, or download the license from the following URL:
 * http://itextpdf.com/terms-of-use/
 *
 * The interactive user interfaces in modified source and object code versions
 * of this program must display Appropriate Legal Notices, as required under
 * Section 5 of the GNU Affero General Public License.
 *
 * In accordance with Section 7(b) of the GNU Affero General Public License,
 * a covered work must retain the producer line in every PDF that is created
 * or manipulated using iText.
 *
 * You can be released from the requirements of the license by purchasing
 * a commercial license. Buying such a license is mandatory as soon as you
 * develop commercial activities involving the iText software without
 * disclosing the source code of your own applications.
 * These activities include: offering paid services to customers as an ASP,
 * serving PDFs on the fly in a web application, shipping iText with a closed
 * source product.
 *
 * For more information, please contact iText Software Corp. at this
 * address: sales@itextpdf.com
 */
namespace iTextSharp.tool.xml.pipeline {

    /**
     * Abstract class with default implementations. Override this instead of
     * implementing IPipeline and let your pipeline override only the methods
     * relevant to your implementation.
     *
     * @author redlab_b
     * @param <T> the type of CustomContext
     *
     */
    public abstract class AbstractPipeline : IPipeline {

        private IPipeline next;

        /**
         * @param next the pipeline that's next in the sequence.
         *
         */
        public AbstractPipeline(IPipeline next) {
            SetNext(next);
        }

        /*
         * (non-Javadoc)
         *
         * @see com.itextpdf.tool.xml.pipeline.IPipeline#getNext()
         */
        public virtual IPipeline GetNext() {
            return next;
        }

        /**
         * Just calls getNext.
         *
         */
        public virtual IPipeline Open(IWorkerContext context, Tag t, ProcessObject po) {
            return GetNext();
        }

        /**
         * Just calls getNext.
         *
         */
        public virtual IPipeline Content(IWorkerContext ctx, Tag currentTag,  string text, ProcessObject po) {
            return GetNext();
        }

        /**
         * Just calls getNext.
         *
         */
        public virtual IPipeline Close(IWorkerContext context, Tag t, ProcessObject po) {
            return GetNext();
        }

        public virtual ICustomContext GetLocalContext(IWorkerContext context) {
            try {
                ICustomContext cc = context.Get(GetContextKey());
                if (null != cc) {
                    return cc;
                }
                throw new PipelineException(String.Format(LocaleMessages.GetInstance().GetMessage(LocaleMessages.OWN_CONTEXT_404), this.GetType().FullName));
            } catch (NoCustomContextException e) {
                throw new PipelineException(String.Format(LocaleMessages.GetInstance().GetMessage(LocaleMessages.OWN_CONTEXT_404), this.GetType().FullName), e);
            }
        }
        /**
         * setNext method. When using this while parsing one can make live
         * changes the pipeline structure. Use with caution.
         *
         * @param next set the next pipeline
         */
        public virtual void SetNext(IPipeline next) {
            this.next = next;
        }

        /**
         * Defaults to the fully qualified class name of the object.
         */
        public virtual String GetContextKey() {
            return this.GetType().FullName;
        }

        /* (non-Javadoc)
         * @see com.itextpdf.tool.xml.Pipeline#init(com.itextpdf.tool.xml.WorkerContext)
         */
        public virtual IPipeline Init(IWorkerContext context) {
            return GetNext();
        }
    }
}
